Nozzle valve



Feb. 2, 1932. F. .1. s'roKEs Erm. 1,843,701-

NozzLE v'ALvE Filed June 23. 1930 /NVENTORS Patented Feb. `2, v1932 A UNITED STATES U"11u-rrr;NT o-FFICE FRANCIS J'. STOKESKAN D CHARLES J. WES'IINY, OE PHILADELPHIA, PENNSYLVANIA, AS-

SIGNORS T0 F. J'. STOKES MACHINE COMPANY, 0F PHILADELPHIA, PENNSYLVANIA, ,Y

A CORPORATION OF PENNSYLVANIA Application led .Tune 23,

prevented from adhering to those surfaces with which it comes in Contact as it is ejected from the valve, and also the tendency to spread by capillary attraction or surface tension to surrounding surfaces from which it may drip, must be overcome.

According to our invention we have successfully met these requirements by having the valve body below the valve seat terminate in a thin knife edge and by providing the inner moving member or valve with a projection having a knife edge, and which member, when the valve is closed, brings its edge even with the stationary edge of the valve body. This projection on the valve acts as a plunger when the valve is being closed and pushes before it liquid whichA would otherwise adhere to t-he outlet of the valve body. Thus when the valve is opened the liquid rushing out comes in contact with the inner side of the valve body and the outer side of the valve projection only, for the knife edge termination of the valve body prevents liquid from spreading up on the outside of the valve body, either by capillary attraction 0r surface tension, and when the valve closes, the projection, acting as a plunger, pushes ahead of it allvmaterial which would otherwise adhere to the inside of the valve body and which instantly drains from the knife edge leaving it clean.

However, if the bottom of the valve was made flat or if it terminated in a knife edge failing t0 have considerable depth, liquid would creep up around the edge and cling to the bottom of the valve. The valve therefore is provided with a deep recess forming the knife edge. Another source of drip is the formation of a partial vacuum under the NozzLE VALVE A1930. yserial No. 463,013.

is occasioned by entrainment of air. This vacuum is intermittently broken by thel outside air pressure and with each break liquid :valve whenliquid is being discharged. `This. l

-isthrown against the bottom of the valve which-later collects and drips. To prevent the formationof this. partial vacuum, a hole is drilled down through the center o f the valve stem and through the valve, which maintainsvan atmospheric pressure at this' point during the discharge.

Our valve therefore has three features which are required for successful operation:

- First, a knife termination of the valve body and movable valve or member; second, a deep cavity in thevalve above the knife edge; and

third, an airV vent through the valve stem.

'The invention comprises the improvements to be presently described and finally claimed.

In the following description reference will be made to the accompanying drawings `forming part hereof. and inwhich Y Figurel is a side view with parts in central section illustrating features of the invention, and l Fig. 2 is a top or plan iu'ew.

In the drawings, 1 and 2 are cylindrical valve elements. The valve body 2 is, below the seat, externally beveled to a thin edge 3.

The movable inner element or valve'l is proi3 vided below the seat with a projection internally beveled to a'thin edge 4. The thin edges are constructed and arranged to come together, as shown'in Fig. 1, and offer no point of rest for material to collect and later drip. There is a cavity 5 in the end of the valve element l. This cavity 5 is vented to the atmosphere. The valve rod G is provided with an opening 7 to the atmosphere and the opening serves to vent the cavity.

Evidently when the valve is closed, the thin edges 3 and 4c of the annular beveled walls afford no place for the lodgment of material, and later drip is obviated. The venting of the cavity 5 to the air prevents the ica it tends to form a iilm which, when the valve is closed, tends to burst and cause drip, but the vent, when present, prevents that action.

In the drawings the described nozzle valve is shown in association with machine parts which vare quite immaterial to the present -invention, although it may be said thatS is `an outlet for the material, and that 9 is a means Y for working the movable valve Yelement into open and closed position.

lt will be obvious to those skilled in the art to which the invention relates that modifications may be made in details of construction and arrangement and matters `ofmere for-111 without departing from the spirit of the invention which is not limited to such matters or otherwise than the prior art and the appended claims may require.

XVe clai-m:

1. A nozzle valve comprising an annular wall larranged below a seat portion and terminating 'in a thin edge and provided on the relatively stationary member of the valve, an annular wall arranged below a seat portion and terminating in a thin edge and provided on the relatively 4movable member of the valve, and a. valve rod having through it an air vent' communicating with a cavity provided in the movable member.

2. A valve structure comprising a valve body having a valve seat and provided below its valve seat with .a thi-n knife edge, an inner moving element or valve seat engaging member having a projection below its seat engaging portion provided with a knife edge, there being provided in the moving element a recess, and anair vent for said recess.

FRANCIS J STOKES. CHARLES J. WESTIN.

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